Julien Baptiste rushes to Hungary to find the British ambassador's family.

Julien and Zsofia track down the tattooed man but he gives little away. Things escalate when the police receive a hostage video, and Emma takes drastic action for her family.

As Julien and Zsofia investigate Far Right politician Kamilla Agoston, Emma finds a lead on Alex's computer that takes her and Julien to a shocking and bloody discovery.

With Alex dead, Emma's only hope is to find her other son Will. And when Julien and Zsofia look to Kamilla and her husband, a new lead is uncovered and a dramatic discovery is made.

With Will safe, Emma and Julien hope to discover the identity of Gomorrah, but instead discover another attack is planned. Now, the pair must race against the clock to prevent it.

Reeling from Will's escape, Emma and Julien must do everything they can to stop the next attack. If they can follow the clues and find Will, perhaps they can succeed.